Merge branch 'pci/virtualization'

  - probe for device reset support during enumeration instead of runtime
    (Bjorn Helgaas)

  - add ACS quirk for Ampere (née APM) root ports (Feng Kan)

  - add function 1 DMA alias quirk for Marvell 88SE9220 (Thomas
    Vincent-Cross)

  - protect device restore with device lock (Sinan Kaya)

  - handle failure of FLR gracefully (Sinan Kaya)

  - handle CRS (config retry status) after device resets (Sinan Kaya)

  - skip various config reads for SR-IOV VFs as an optimization (KarimAllah
    Ahmed)

* pci/virtualization:
  PCI/IOV: Add missing prototypes for powerpc pcibios interfaces
  PCI/IOV: Use VF0 cached config registers for other VFs
  PCI/IOV: Skip BAR sizing for VFs
  PCI/IOV: Skip INTx config reads for VFs
  PCI: Wait for device to become ready after secondary bus reset
  PCI: Add a return type for pci_reset_bridge_secondary_bus()
  PCI: Wait for device to become ready after a power management reset
  PCI: Rename pci_flr_wait() to pci_dev_wait() and make it generic
  PCI: Handle FLR failure and allow other reset types
  PCI: Protect restore with device lock to be consistent
  PCI: Add function 1 DMA alias quirk for Marvell 88SE9220
  PCI: Add ACS quirk for Ampere root ports
  PCI: Remove redundant probes for device reset support
  PCI: Probe for device reset support during enumeration

Conflicts:
	include/linux/pci.h

1 files changed, 35 insertions, 7 deletions

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 538de9057c23..8adf4a64f291 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -112,6 +112,29 @@ resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
 	return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
 }
 
+static void pci_read_vf_config_common(struct pci_dev *virtfn)
+{
+	struct pci_dev *physfn = virtfn->physfn;
+
+	/*
+	 * Some config registers are the same across all associated VFs.
+	 * Read them once from VF0 so we can skip reading them from the
+	 * other VFs.
+	 *
+	 * PCIe r4.0, sec 9.3.4.1, technically doesn't require all VFs to
+	 * have the same Revision ID and Subsystem ID, but we assume they
+	 * do.
+	 */
+	pci_read_config_dword(virtfn, PCI_CLASS_REVISION,
+			      &physfn->sriov->class);
+	pci_read_config_byte(virtfn, PCI_HEADER_TYPE,
+			     &physfn->sriov->hdr_type);
+	pci_read_config_word(virtfn, PCI_SUBSYSTEM_VENDOR_ID,
+			     &physfn->sriov->subsystem_vendor);
+	pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID,
+			     &physfn->sriov->subsystem_device);
+}
+
 int pci_iov_add_virtfn(struct pci_dev *dev, int id)
 {
 	int i;
@@ -134,13 +157,17 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
 	virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
 	virtfn->vendor = dev->vendor;
 	virtfn->device = iov->vf_device;
+	virtfn->is_virtfn = 1;
+	virtfn->physfn = pci_dev_get(dev);
+
+	if (id == 0)
+		pci_read_vf_config_common(virtfn);
+
 	rc = pci_setup_device(virtfn);
 	if (rc)
-		goto failed0;
+		goto failed1;
 
 	virtfn->dev.parent = dev->dev.parent;
-	virtfn->physfn = pci_dev_get(dev);
-	virtfn->is_virtfn = 1;
 	virtfn->multifunction = 0;
 
 	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
@@ -161,10 +188,10 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
 	sprintf(buf, "virtfn%u", id);
 	rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
 	if (rc)
-		goto failed1;
+		goto failed2;
 	rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
 	if (rc)
-		goto failed2;
+		goto failed3;
 
 	kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
 
@@ -172,11 +199,12 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
 
 	return 0;
 
-failed2:
+failed3:
 	sysfs_remove_link(&dev->dev.kobj, buf);
+failed2:
+	pci_stop_and_remove_bus_device(virtfn);
 failed1:
 	pci_dev_put(dev);
-	pci_stop_and_remove_bus_device(virtfn);
 failed0:
 	virtfn_remove_bus(dev->bus, bus);
 failed: